mcp-error-handling-mcp-server-fails-e-g-due-to-missing-environment-va-e3d4d1bf

THEN Use the server's `sendLoggingMessage` method to send error-level messages to the client. On the client side, register a notification handler for `LoggingMessageNotificationSchema` to capture and display those messages, enabling effective error reporting from the server.

// Server-side error reporting: await server.sendLoggingMessage({ level: "error", data: "Missing required env: API_KEY" });
// Client-side handler: client.setNotificationHandler(LoggingMessageNotificationSchema, (notification) => { console.error(notification.data); });